crafty-4/app/classes/shared/installer.py

import sys
import subprocess

class install:

    @staticmethod
    def is_venv():
        return (hasattr(sys, 'real_prefix') or
                (hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix))

    def do_install(self):

        # are we in a venv?
        if not self.is_venv():
            print("Crafty Requires a venv to install")
            sys.exit(1)

        # do our pip install
        subprocess.check_call([sys.executable, "-m", "pip", "install", "-r", 'requirements.txt'])
        print("Crafty has installed it's dependencies, please restart Crafty")
        sys.exit(0)

installer = install()